File:Tap changer.svg

The tap changer is currently set to tap position 2, with load supplied directly via the right hand connection. Diverter resistor A is short-circuited, diverter B is unused.

If the tap changer is moved to tap 3, the following sequence occurs:


 * 1) Switch 3 closes, an off-load operation.
 * 2) Rotary switch turns, breaking one connection and passing load current through diverter resistor A.
 * 3) Rotary switch continues to turn, connecting between contacts A and B. Load now supplied via diverter resistors A and B, winding turns bridged via A and B.
 * 4) Rotary switch continues to turn, breaking contact with diverter A. Load now supplied via diverter B alone, winding turns no longer bridged.
 * 5) Rotary switch continues to turn, shorting diverter B. Load now supplied directly via left hand connection. Diverter A is unused.
 * 6) Switch 2 opens, an off-load operation.